few ideas:
Stationing instructors at the top and bottom of bump runs for the purpose of providing tips. Give the tip at the top and the follow-up at the bottom.
Have you ever taken a group lesson? Next time, take note of the people in the class...
You are suggesting that a single "tip" that you can give any skier will do any good whatsoever. The majority of those that take group lessons really need them. They need the moves explained and demonstrated in detail before they try them. Then, most are so fearful of trying them and failing, that they only give 50% effort. And those are
paying customers. I'm not even counting those that just don't understand what it is the instructor is even talking about.
Now we are suggesting that the recipients of freebie tips are going to try harder? Sheesh, most people either won't paying attention to the know-it-all a the top/bottom, or won't understand what they are talking about.
Worse yet, they will be getting an arbitrary sequence of tips. There is no foundation upon which to build the steps to get to the next level. Most people are clueless about how they are skiing, what they are doing, and why what they do works (if they are so lucky that what they do actually works).
The tip they get has no chance of taking root in their lives. What they need is to be taught the basics first, like stance, balance, coordination, timing, edging.... The last thing they need is a disconnected series of tips from some talking head on the top of the hill. An analogy is that you build the foundation before the house.
On top of that:
There is a level of commitment required by the student to learn how to ski. Giving away free lessons won't magically create that commitment. I mean, have you ever heard from anyone: "I really want to learn how to ski, but I can't afford a lesson?" That's a cop-out: they can afford the lift, transportation, time and equipment, but they are really scared of admitting that they really can't ski, and putting their reps on the line by taking lessons. Afterall, if you take them, then you have to be good right? What happens when they don't get better right away?
How many times have you seen people take a lesson and then never practice any of the moves/drills they were taught on their own time? I'd say most of the time. People tend to view lessons as magic -- you take them and they make you a better skier. Period. If you don't become a better skier right away, something is wrong with what is being taught or the instructor, or the equipment etc.... Can't be that the student only ski's 5 times/year, and then on runs well above his/her ability.
Free lessons won't help getting anyone to practice. Bottom line is, if you want something bad enough, you'll commit to doing it.